First off, welcome to the forum.
This question keeps getting asked over and over again. Your build totally depends on you... we are not there and we will not be riding the bike ever. Figure out what is your style and go with the one that feels and looks the best to you. If its your first build then I'd say go with the single speed, less things to worry about maintaining. Which ever one has better brakes
Do a search and see what other members have done with those bikes.